раннє середньовіччя Early Middle Ages Penkovka Poltava region Полтавська область пеньківська культура 5th – 8th centuries CE 6th — 7th centuries 6th—7th century Cheremushna Cherniakhiv Crimea Eastern European barbarous emaciated enamels Kolochin cultures Kolochyn culture Kyiv Penkivka culture Penkivska cultures Pre-Caucasus T-shaped belt plaque with U-shaped hole V-VII centuries VI —VII ст VI—VII ст VІ—VII вв VІ—VII ст V—VIII ст V—VІII ст anthropomorphic figure belt fittings complexes of Martynivk circlea